Lub flange yog ib qho sab nraud lossis sab hauv, lossis ntug (duab), rau lub zog, raws li lub flange ntawm cov nqaj hlau xws li I-beam lossis T-beam; los yog rau kev txuas mus rau lwm yam khoom, raws li lub flange ntawm qhov kawg ntawm ...
Nyeem ntxiv